Click and drag to rotate the model. Scroll using a mouse or trackpad to zoom in and out.
Use the explode button (⌘B), or drag the slider, to separate the brain into its individual parts.
While an area is selected, use the isolate button (⌘I), or drag the slider, to set the opacity of surrounding brain areas.
By default, the brain listens to your mouse; when an area is in focus, it tracks that area until it is deselected. To disable/enable this, click the object tracking button. The current status is always visible in the bottom left.